This is extremely surprising.
Remembering this relationship in the form of a formula is a mistake as you just can missed it up in your head, as happened to you.
The longer the riverbed and the greater the distance the water has to cover, more stones in the way, creating more resistance in total.
The wider the channel, the easier it is for the water to flow through, i.e. it encounters less resistance.
And also V=RI.
The higher resistance (the longer the riverbed or narrower channel) a greater level difference (voltage) is needed to ensure the same flow of water (current). To increase flow level difference have to be increased.
1 Like
I also watched a great part of the vid and found it very interesting not only for PCB design but in general regarding my electronic culture around grounding and interference. I learnt a lot of things even though I don’t see exactly how I could apply the different advices given in the video without redesigning the whole PCB… And I am unfortunately running out of time on this project. But now at least I don’t have any very “big holes” anymore as you can see :
But I still have those long wire holes though… At least they’re thin so the surface isn’t that big meaning they might not act like antennas that much.
1 Like
I find this very amusing because my whole interpretation of wires was the other way around. I considered imagined when you make a wire wider there is more volume to go through for electrons so more obstacles… just like for the length.
And of course the longer it is the more resistance that’s something I always understood and made sense for me.
Thanks for sharing your analogy!
But if electrons ‘decide’ to use only part of wire (as it was before making it wider) then R is not changed. The rest of wider wire gives them other ways to go in paralel so in the same time with the same voltage more of them will cover the distance so resultant resistance is lower.
So for your home’s wires to handle a huge amount of current, they should be made as thin as possible. Something wrong with that logic, I think. 
1 Like
The analogy I’ve always used is a water tank with and input pipe (with tap) at the top and an output pipe (with tap) at the bottom. It covers many electrical fundamentals.
I’m not sure if you follow his thinking well.
Huge amount of current obviously needs a wide wire (to have a place for that current) but unfortunately the wider wire has higher resistance but who cares…
Isn’t folk physics fun? Like when Wile E Coyote runs off a cliff horizontally for a distance then drops vertically. What’s more he doesn’t start dropping until he realises he’s in mid-air. 
This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.